With the growth of online commerce, the path or journey undertaken by a customer to lead to a purchase decision has become increasingly complex. To use an analogy used by Nielsen in their 2013 Australian Connected Consumer Report, when you think of the landscape as a Rubik's cube, consumers rarely fit on one side; they fit across multiple blocks and their path isn't finite.
The result of this is that marketers need to start to rethink the way they view the customer journey in order to get a more accurate picture of their marketing efforts.
So while we understand that marketing channels such as email, display, paid search and social influence customers at different points, they in fact can also influence each other, meaning we shouldn't judge them in isolation.